Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions
With plenty of parallel inverters connected to a weak grid at the point of common coupling (PCC), the impedance coupling interactions between the inverters and the grid are enhanced, which may cause high-frequency harmonic oscillation and further aggravate the system instability. In this paper, a ba...
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| Format: | Article |
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MDPI AG
2018-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/11/12/3441 |
| _version_ | 1798027044628463616 |
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| author | Ling Yang Yandong Chen Hongliang Wang An Luo Kunshan Huai |
| author_facet | Ling Yang Yandong Chen Hongliang Wang An Luo Kunshan Huai |
| author_sort | Ling Yang |
| collection | DOAJ |
| description | With plenty of parallel inverters connected to a weak grid at the point of common coupling (PCC), the impedance coupling interactions between the inverters and the grid are enhanced, which may cause high-frequency harmonic oscillation and further aggravate the system instability. In this paper, a basic technique for inverter output impedance is proposed to suppress the oscillation, showing that the inverter output impedance should be designed relatively high at the harmonic oscillation frequency, while relatively low at other frequencies. On the basis of the proposed technique, two virtual impedances are added to be in parallel and in series with the original inverter output impedance, respectively. Thus, an oscillation suppression method by two notch filters is proposed to realize the virtual impedances and increase the whole system damping. The implementation forms of the virtual impedances are presented by the proposed PCC voltage feedforward and grid-side inductor current feedback with two notch filters. Finally, simulation and experimental results are provided to verify the validity of the proposed control method. |
| first_indexed | 2024-04-11T18:44:59Z |
| format | Article |
| id | doaj.art-39729de7eb0f49c4ae1e1a1a6651e086 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T18:44:59Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-39729de7eb0f49c4ae1e1a1a6651e0862022-12-22T04:08:51ZengMDPI AGEnergies1996-10732018-12-011112344110.3390/en11123441en11123441Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid ConditionsLing Yang0Yandong Chen1Hongliang Wang2An Luo3Kunshan Huai4College of Electrical and Information Engineering, Hunan University, Changsha 410082, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha 410082, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha 410082, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha 410082, ChinaGuangzhou Power Supply Co., Ltd., Guangzhou 510620, ChinaWith plenty of parallel inverters connected to a weak grid at the point of common coupling (PCC), the impedance coupling interactions between the inverters and the grid are enhanced, which may cause high-frequency harmonic oscillation and further aggravate the system instability. In this paper, a basic technique for inverter output impedance is proposed to suppress the oscillation, showing that the inverter output impedance should be designed relatively high at the harmonic oscillation frequency, while relatively low at other frequencies. On the basis of the proposed technique, two virtual impedances are added to be in parallel and in series with the original inverter output impedance, respectively. Thus, an oscillation suppression method by two notch filters is proposed to realize the virtual impedances and increase the whole system damping. The implementation forms of the virtual impedances are presented by the proposed PCC voltage feedforward and grid-side inductor current feedback with two notch filters. Finally, simulation and experimental results are provided to verify the validity of the proposed control method.https://www.mdpi.com/1996-1073/11/12/3441weak gridparallel invertersoscillation suppressionnotch filterimpedance reshaping |
| spellingShingle | Ling Yang Yandong Chen Hongliang Wang An Luo Kunshan Huai Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions Energies weak grid parallel inverters oscillation suppression notch filter impedance reshaping |
| title | Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions |
| title_full | Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions |
| title_fullStr | Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions |
| title_full_unstemmed | Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions |
| title_short | Oscillation Suppression Method by Two Notch Filters for Parallel Inverters under Weak Grid Conditions |
| title_sort | oscillation suppression method by two notch filters for parallel inverters under weak grid conditions |
| topic | weak grid parallel inverters oscillation suppression notch filter impedance reshaping |
| url | https://www.mdpi.com/1996-1073/11/12/3441 |
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